Question

Solve 5r2 – 12 = 68. {±4} {±5} {±3} {±6}

Answer 1

Hey there!

Assuming you meant

`5r^2 - 12 = 68`

If so, follow these steps so it can be a little bit easier to solve

Firstly, we have to
`add` by
`12` on each of your sides

`5r^2 -12 +12 \\ \\ 68 + 12`

`5r^2 = 5r^2 \\ \\ 68 + 12 = 80`

We get:
`5r^2 =80`

Now, we have
`divide` by
`5` on each of your sides

`(5r^2)/(5) = (80)/(5)`

`(80)/(5) = 16`

We get:
`r^2 = 16`

`r =` ±
`√(16)`

Therefore , your answer is:
`r =` ±
`4`

Good luck on your assignment and enjoy your day!

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`LoveYourselfFirst:)`